Ask question

Ask question

All categories

3 years ago

11

How many unpaired electrons does calcium have? You may need to draw the orbital filling diagram for the last sublevel that conta

ins electrons.
A) 0
B) 2
C) 4
D) 1

1 answer:

beks73 [17]3 years ago

6 0

Answer:

0

Explanation:

Ca has 20 electrons

You might be interested in

Assuming that the bath contains 250.0 g of water and that the calorimeter itself absorbs a negligible amount of heat, calculate

Anvisha [2.4K]

Answer:

$-3272$ kJ/mol

Explanation:

Given and known facts

Mass of Benzene $= 0.187$ grams

Mass of water $= 250$ grams

Standard heat capacity of water $= 4.18$ J/g∙°C

Change in temperature ΔT $= 7.48$ °C

Heat

$=250 * 4.18 * 7.48\\=7816.6 \\=7.82$

Heat released by benzine is - 7.82 kJ

Now, we know that

$0.187$ grams of benzene release $= -7.82$ kJ heat

So, $1$ g benzine releases

$\frac{ -7.82 }{0.187}\\= -41.8$

kJ/g

$0.187 * \frac{1}{78.108}=0.00239$ mol C6H6

Heat released

$= \frac{-7.82}{ 0.00239}$

$=-3272$ kJ/mol

4 0

3 years ago

How are covalent network solid similar to ionic solids?

olasank [31]

Ionic solids have high melting points and are rather hard. ... Covalent solids comprise two- or three-dimensional networks of atoms held together by covalent bonds; they tend to be very hard and have high melting points

7 0

3 years ago

Which option is an example of a physical change? Question 3 options: baking bread burning paper cooking eggs cutting paper

Aleks04 [339]

Answer:cutting paper

Explanation:

4 0

3 years ago

For each molecule below draw the structural formula of the molecule

torisob [31]

I think you forgot to post a picture

5 0

4 years ago

Which substance will evaporate first???????????????????

torisob [31]

Answer:

I think it would be a liquid.

Explanation:

If the temperature hits a certain point, it will turn to ice. If the ice gets exposed to heat, it will melt and return back to it's natural form, a lqiuid. If the liquid is exposed to enough heat, it will evaporate. Not sure if this is right, but I tried my best!

3 0

3 years ago